67991740 has 24 divisors (see below), whose sum is σ = 142939440. Its totient is φ = 27166848.

The previous prime is 67991723. The next prime is 67991743. The reversal of 67991740 is 4719976.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67991743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30504 + ... + 32656.

It is an arithmetic number, because the mean of its divisors is an integer number (5955810).

Almost surely, 2^67991740 is an apocalyptic number.

It is an amenable number.

67991740 is an abundant number, since it is smaller than the sum of its proper divisors (74947700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67991740 is a wasteful number, since it uses less digits than its factorization.

67991740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741 (or 3739 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 67991740 is about 8245.7103999595. The cubic root of 67991740 is about 408.1489828210.

The spelling of 67991740 in words is "sixty-seven million, nine hundred ninety-one thousand, seven hundred forty".